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(4 pts) How many permutations of the letters a, a, a, b, b, b, c, c, c, d, d, d are there with no three consecutive letters the same?

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DISCRETE MATHEMATICS 1 TEST 1

SPECIMEN

1. (4 pts) How many ways are there to distribute 18 balls among 6 different persons if a) each ball is different and each person should get 3 balls

b) all balls are identical ?

2. (5 pts) Show by combinatorial arguments that:

Xm k=0

m k

! n r + k

!

= m + n m + r

!

.

3. (5 pts) Show that P (n, k) = P (n − 1, k − 1) + P (n − k, k) for each 1 < k < n.

4. (4 pts) How many permutations of the letters a, a, a, b, b, b, c, c, c, d, d, d are there with no three consecutive letters the same?

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